As Silver Warrior said, I tried it but I failed.
Unfortunatelly, Allegro 4.x internals are quite obscured, and the library wasn't designed to be used in other languages than C and C++. That's why I didn't ported any of the original add-ons included with Allegro 4.4 (I tried to port AllegroGL too ).
Also I tried to use BeRoPNG but I failed too. It was quite confusing.
Now, I'll answer your message here.
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